1. Chapter 31 Fundamentals of Programming in VB(Continue I) Numbers Arithmetic Operations Variables Incrementing the Value of a Variable

2. Chapter 32 Numbers continued The Integer Data Type Multiple Declarations Parentheses Three Types of Errors

3. Chapter 33 Arithmetic Operations Numbers are called numeric literals For example Whole number: -10, -3, 0, 4, 20 Five arithmetic operations in Visual Basic + addition - subtraction * multiplication / division ^ exponentiation

4. Chapter 34 Numeric Expressions 2 + 3 3 * (4 + 5) ((3+4) * 6) / (12+4) 2 ^ 3 =2 3

5. Chapter 35 Displaying Numbers Let n be a number or a numeric expression. The statement below add the value of n in the list box. (The value of n is then displayed) lstBox.Items.Add(n) The name of a list box Items is the list box’s property (representing a list of items stored in the listbox) Adds an item to the list of items

6. Chapter 36 Example: Form

7. Chapter 37 Example: Code and Output Private Sub btnCompute_Click (...) Handles btnCompute.Click lstResults.Items.Add(5) lstResults.Items.Add(2 * 3) lstResults.Items.Add((2 ^ 3) – 1) End Sub Output 5 in list 6 box 7

8. Chapter 38 Example: Code using With Private Sub btnCompute_Click (...) Handles btnCompute.Click With lstResults.Items.Add(5).Add(2 * 3).Add((2 ^ 3) – 1) End With End Sub

9. Chapter 39 Numeric Variable A numeric variable is a name to which a number can be assigned. Examples: speed distance interestRate balance

10. Chapter 310 Variables Declaration: Dim speed As Double Variable name Data type Assignment: speed = 50 Variable Name: Up to 16,383 characters long, must being with a letter or an underscore

11. Chapter 311 Numeric Data Type Visual Basic type Nominal Storage allocation Value range Byte1 byte0 through 255 (unsigned) SByte1 byte-128 through 127 (signed) Short2 bytes-32,768 through 32,767 (signed) Integer4 bytes-2,147,483,648 through 2,147,483,647 Long8 bytes-9,223,372,036,854,775,808 through 9,223,372,036,854,775,807 (9.2...E+18) Single4 bytes-3.4028235E+38 through -1.401298E-45; 1.401298E-45 through 3.4028235E+38 Double8 bytes-1.79769313486231570E+308 through -4.94065645841246544E-324 ; 4.94065645841246544E-324 through 1.79769313486231570E+308

12. Chapter 312 Initialization Numeric variables are automatically initialized to 0: Dim varName As Double To specify a nonzero initial value Dim varName As Double = 50

13. Chapter 313 Numeric Expressions Numeric variables can be used in numeric expressions. Dim balance As Double = 1000 lstBox.Items.Add(1.05 * balance) Output: 1050

14. Chapter 314 Assignment Statement Dim numVar1 As Double = 5 Dim numVar2 As Double = 4 numVar1 = 3 * numVar2 lstBox.Items.Add(numVar1) Output: 12 The number 12 is added to the item of lstBox

15. Chapter 315 Incrementing To add 1 to the numeric variable var var = var + 1 Or as a shortcut var += 1 Or as a generalization var += numeric expression

16. Chapter 316 Lab